1、東北農(nóng)業(yè)大學(xué)碩士學(xué)位論文向日葵列當(dāng)寄生機(jī)理的研究姓名：黃長(zhǎng)權(quán)申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：植物保護(hù)；農(nóng)藥學(xué)指導(dǎo)教師：趙長(zhǎng)山20120604ABSTRACTResearchontheParasiticMechanismofOrobancheCumanaWallrAbstractTheripeseedsofOrobancheCumanaWallrneedaafterripeningforaperiodoftimeaftertheirabsciss
2、ion，afterbeingpreculturedforacertaintime；theseedswhichhavebeenfinishedafterripeningcangerminateonlyunderinductionofsunflowerrootexudatesandotherexogenoussignalmaterial，andthengrowouthaustoriumwhichcanpierceintotherootsof
3、sunflowertodrawnutrientsubstanceandwaterformsunflowerplant，andthenparasiticrelationissetupTheearliestperiodofsunflowerbroomrapeemergenceissquaringperiodofsunflowerwhenmostofthesunflowersareinfloweralargenumberofsunflower
4、broomrapeshasbeenemerged，butsunflowerbroomrapesareneverbeenfoundemergencewhensunflowersareintheirseedlingperiod。Atpresent，thestudyofOrobancheCumanaWallrhomeandaboardmainlyfocusonitsbiologicalcharacteristics，damageandcont
5、rol，however，SOfartherearenoresearchesongerminationmechanismofOrobancheCumanaWallrThisarticlewishtogathersunflowerrootexudatesatseedlingperiodandsquaringperiodbythemethodofHydroponiccollectmethod，accordingtotheresearchthi
6、nkingofBioassayguidingseparation，theseparationandidentificationofseedgerminationirritantwasguidedbyseedgerminationtrialsofOrobancheCumanaWallrandfinallyidentifiedthesortofseedgerminationirritant，madesurethespecificemerge
7、nceperiodResultsareasfollows：thecompoundtypecompositionsofsunflowerrootexudatesinthetwoperiodsareroughlythesame，justdifferentatthechemicalcompositionandrelativecontentofsomecompounds，andsunflowerrootexudatesareconstantly
8、accumulatedwithsunflowergrowing，atthesametime，somecompoundsaretransformedordegraded1，BoththesunflowerrootexudatesatseedingperiodandsquaringperiodcaninducethegerminationofOrobancheCumanaWallritistosaysunflowerrootcanexuda
9、teseedgerminationirritantofOrobancheCumanaWallrbothatseedingperiodandsquaringperiodAtthesametime，concentrationofgerminationstimulusatsquaringperiodissignificantlyhigherthanseedlingperiod。2ThereiSDehydrocostuslactoneinsun
10、flowerrootexudates，whichcaninducethegerminationofOrobancheCurnanaWallr3WiththeconcentrationofDehydrocostuslactonerising，lowconcentrationcanpromoteseedgermination，buthighconcentrationwillinhibitseedgermination4OrobancheCu